feat(cubestore): Introduce support for DATE_ADD

[ovr]

Hello!

Thanks

[ilya-biryukov]

Thanks! Mostly LG, but let's ensure this covers corner cases

[ilya-biryukov]

Don't unwrap, return errors instead.

[ovr]

Option<T> doesnt support map_err and it's not possible to implement impl From to DFErrror (it requires modern rust with try_trait feature), it's why I wrote a small fn helper

fn datetime_safety_unwrap(opt: Option<DateTime<Utc>>) -> Result<DateTime<Utc>, DataFusionError> {
    if opt.is_some() {
        return Ok(opt.unwrap());
    }

    return Err(DataFusionError::Internal(
        "Unable to calculate operation between DateTime and Interval".to_string(),
    ));
}

[ilya-biryukov]

Could you add a few more tests?
At least these corner cases should be covered:

• Add one day to Jun 30
• Add one month to Dec
• Add one day to Feb 28 on a leap year and non-leap year
• add one year to Feb 29 on a leap year
• add one minute to 23:59:00
• add one month to Jan 30
• add one month to Jan 29 on a non-leap year and a leap year

Is there a way to get negative values in the intervals?
If no, please add assertions.
If yes, please add tests.